221453404 has 12 divisors (see below), whose sum is σ = 390502728. Its totient is φ = 109881200.

The previous prime is 221453389. The next prime is 221453437. The reversal of 221453404 is 404354122.

It is a happy number.

221453404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221453404² = 98083220286374432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210787 + ... + 211834.

It is an arithmetic number, because the mean of its divisors is an integer number (32541894).

Almost surely, 2^221453404 is an apocalyptic number.

It is an amenable number.

221453404 is a deficient number, since it is larger than the sum of its proper divisors (169049324).

221453404 is a wasteful number, since it uses less digits than its factorization.

221453404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422756 (or 422754 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 221453404 is about 14881.3105605656. The cubic root of 221453404 is about 605.0075394639.

The spelling of 221453404 in words is "two hundred twenty-one million, four hundred fifty-three thousand, four hundred four".